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Access Restriction Bypass Affecting istio.io/istio/pilot/pkg/xds package, versions >=1.9.0 <1.9.5 <1.8.6

0.0
high

Snyk CVSS

    Attack Complexity Low
    Scope Changed

    Threat Intelligence

    EPSS 0.34% (71st percentile)
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NVD
9.8 critical
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Red Hat
10 critical

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  • Snyk ID SNYK-GOLANG-ISTIOIOISTIOPILOTPKGXDS-1299110
  • published 3 Jun 2021
  • disclosed 3 Jun 2021
  • credit John Howard of Google
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Introduced: 3 Jun 2021

CVE-2021-31921 Open this link in a new tab
CWE-284 Open this link in a new tab

How to fix?

Upgrade istio.io/istio/pilot/pkg/xds to version 1.9.5, 1.8.6 or higher.

Overview

Affected versions of this package are vulnerable to Access Restriction Bypass. When a gateway is using the AUTO_PASSTHROUGH routing configuration, attackers can bypass authorization checks and access unexpected services in the cluster.

This vulnerability only impacts usage of the AUTO_PASSTHROUGH Gateway type, which is typically only used in multi-network multi-cluster deployments. See the Istio advisory for more information on triaging the impact of this vulnerability.